NOTE: The source article appears to be based off of a NOAA Tsunami preparedness and event model:http://nctr.pmel.noaa.gov/cascadia_simulated/index.html This is intended for public awareness, not a live warning.
An ocean data buoy is alerting to an “event” in the Cascadia Subduction Zone off the west coast of Oregon. This is where a magnitude 9 earthquake hit in 1700.
According to the data buoy, the water column height (depth) fell sharply within minutes off the coast of Oregon, signaling the land beneath the ocean has suddenly “sunk.”
As of 0231:30, the initial water column height is 2738.80 Meters deep (8985.56 feet). Two minutes and thirty seconds later, that same water column height had dropped to 2738.66 Meters deep (8985.10 feet). Where did the four inches of water disappear to? Answer: The earth sunk; and continued to sink for the next several HOURS. As you can see from the second chart above, from 0230 GMT to 0600 GMT, the ocean continued to sink to 2737.7 meters deep (8981.95 feet). The buoy is too far away from shore to be affected by high/low tide, so where did the four feet of ocean water disappear to?
This means a Tectonic Plate in the Ocean named the “Juan de Fuca Plate” has made a sudden, eastward movement and slipped beneath another Tectonic Plate named the “North American Plate.” This type of event is usually followed by a massive upward movement of the North American Plate causing a very severe earthquake.
The entire column of water . . . all 8985 feet of it . . . is what dropped four feet. And it did so over an area several miles wide. When the tectonic plate snaps back upward, it can launch that entire 8985 foot column of water upward and toward the shore. As the continental shelf rises toward the shore (the ocean gets more shallow) that 8985 foot column of water starts accumulating upon itself as it moves toward shore, becoming one massive wave, perhaps 45-50 feet tall, that hits the shore for twenty minutes. If such a thing were to happen today, hundreds-of-thousands of people would be killed as a fifteen meter (45 foot) wall of water came ashore well inland passing Interstate 5 and destroying everything its path from the beach to Interstate 5.